If the first appearance of this Column had caused alarm and perplexity among the troops of the French Left Wing, the apprehensions it excited on the Prussian Right, when its Cavalry was observed to advance and to drive back Colonel MARWITZ' Brigade, which had been sent towards it _en reconnaissance_ (as already explained), were still greater; and its equally unexpected disappearance (with the exception of its Cavalry, and a portion of its Infantry), at a moment when it was felt that its vigorous co-operation must have rendered the issue of the Battle no longer doubtful, was looked upon as a particularly fortunate turn of affairs; and BLÜCHER's hopes revived as he prepared to carry into effect his meditated attack upon the French Left Flank. There did not appear on the part of NAPOLEON any eagerness to resume the movement of the Imperial Guard towards the lower extremity of Ligny, but rather an anxiety to await calmly the most favourable moment for his projected attack. Doubtless he had discovered the march of the remaining Battalions of Colonel LANGEN's Brigade, from Sombref towards St Amand, as a further reinforcement to the Prussian Right, and calculated upon paralysing the attack which BLÜCHER was evidently preparing against his Left Flank, by executing a sudden and vigorous assault on the Prussian Centre, with a preponderating mass of fresh troops. * * * * * At length, towards eight o'clock, the Emperor gave the Order for the Guard and MILHAUD's Corps of _Cuirassiers_ to resume their march. The same precautions were observed as before for masking the movement as much as possible, and so successfully, that THIELEMANN, on observing a French Battery opposite Tongrines entirely withdrawn, and GROUCHY's lines of Cavalry presenting a diminished extent of front, and conceiving, at the same time, that the contest in Ligny was assuming a change favourable to the Prussians, concluded that the moment had then arrived in which an attack might be made with every probability of success, upon the Right Flank of the Enemy. He had only one Brigade remaining of the Cavalry of his Corps, namely that of Colonel Count LOTTUM; the other Brigade, under Colonel MARWITZ, having been, as already explained, for some time detached to the extreme Right of the Prussian Army. General HOBE, who commanded this Cavalry Division, had previously moved forward Count LOTTUM's Brigade and posted it in rear of Colonel KÄMPFEN's Infantry Brigade. THIELEMANN now desired him to advance with LOTTUM's Brigade and the Horse Battery No. 19, along the Fleurus high road.